Sensor performance has an important impact on accurate and efficient acquisition of traveling wave fault signals,to study the transmission characteristics of noncontact voltage sensors of different materials，Firstly,wavelet packet decomposition is performed on the acquired signal by wavelet packet energy spectrum method，Using matlab software to fit the different attenuation laws of the energy collected by different material sensors in the same frequency band to analyze sensor transfer characteristics;Secondly, using the matlab tool to write the calculation program of the incoming wave pulse width, judging the obvious degree of the acquired waveform according to the pulse width value and the attenuation of the original signal amplitude to judge the difficulty of signal acquisition;Finally, the accuracy of the positioning is analyzed from the perspective of positioning error;In summary, the magnesium metal sheet has good transfer characteristics in traveling wave ranging. This can provide an important reference for the selection and design of sensor materials.